Looking for help with my Ngons
May be the possible solutions : 


Best option : Manually edit and make it quads. 
Option 2 : convert to
triangles-> decimate modifier(try planner)-> convert to tris->convert
to quads-> remove doubles  ( try adding bevel modifier) 
option 3 :
remove doubles if any -> add a bevel modifier 
option 4 : subdivide
too much-> export to zbrush and use decimation process